israel struck at suspected hamas sites. palestinian health officials said 19 people have been killed in gaza since the israeli offensive began. the conflict could escalate even further israeli troops and tanks amassed at the border. >> i hope had a mazz and other terrorist organizations in gaza got the message. if not israel is prepared to take whatever action is necessary to defend our people. >> despite that message, militants continued to attack targets in southern israel. three israelis were killed when a rocket struck their apartment building were buried thursday. neighbors said the threat of violence won't force her to leave. >> my place. i love this place. >> even though another rocket could come any time. >> even ten times. >> for the first time hamas launched iranian made rockets capable of reaching tel aviv. israeli defense officials say while hamas has fired over 300 rockets, israel's missile defense system intercepted 130 of them. this latest round of violence ratcheted up on wednday, israel killed hamas's chief